Reddit ecig communities:

(general e-cigarette discussion)(about vaping in the EU)(subreddit for more seasoned vapers)(dedicated to rebuildable atomizers)(discussion about DIY e-liquids)(vapers showing off their vaping gear)(messages from e-cig vendors and suppliers)(selling and exchanging of juices and ecig stuff)(offering of surplus e-liquids and ecig stuff)

Information about vaping and ecigs:

Research and medical studies on ecigsE-Cigarette Forum's informational pageTools, learning and support for vapersOpinion, information, reviews and advice on vapingGuides, info and various resourcesThe most complete glossary about vaping